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alot of cars show a crankposition sensor on a test if it was bad car would not run unless you have a problem with car stalling or running bad when it gets hot not a ignition module if car still runs good not a major problem one problem would be a bad 02 sensor does not mess with car alot gas milage loss mabe slight hesitaion look at sensors that dont mess with engine if not 02

does it start at all, or does it run for about 1 second and shut off? if the latter, then it's the passlock system, and he could have a defective key or security module. the keys have a predetermined resistance value which activates the passlock system to prevent hotwiring. If it is the passlock system, then sometimes you have to wait 15-20 mins for it to reset before starting the engine.

If the lights on the dash all come on but the engine wont turn over it could be a problem with the VAT security system. Your key has a little chip on it between the teeth and the handle. This is a common problem with GMs', often just replacing the key is necessary but sometimes the VAT module needs to be replaced.

on the v6- 3.1 yes you do. here is how to change it yourself, first of all, release tension on the belt tensioner. remove belt from pulleys, place a floor jack under engine on motor mount side to take off. put a piece of wood on jack to protect engine. jackup to engine with very slight pressure to hold it while removing mount. take off mount, remove old belt, put new belt on. the tensioner can be moved with a 3/8 drive in tensioner hole. after belt is on replace mount. then lower jack down. thats it!!

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The security light is for anti-theft system ,when the light is on or flashing ,it think's the vehicle is being stolen . It will disable the fuel system ( fuel injectors ) so it won't start ! Does your key have a pellet on the side of the key ? Trying to find out which anti-theft system yours has . If it does have a little black pellet on the side of the part that goes into the ignition lock cylinder , That pellet is a resistor an when you fit into the the lock cylinder there are two contacts inside the lock that read the resistance . There is a module that then can say if it's the right resistance or not , allowing or not to let the fuel injectors fire. The problem with this anti-theft system the contacts and or the wires break ! This is the VAT'S - vehicle anti -theft system or they have pass lock - pass key 1 , 2 , 3 . On the vats system a by-pass can be done . On you tube there are videos showing how to do it .

Next time this happens, Look for a light on the dash that says SECURITY. When this light comes on, it will shut the starter and/or the injectors off in the vehicle. This light comes on when the antitheft system starts to fail. This is very common in GM vehicles like your Olds. If you see this light, go to this link for info and answers.

on the v6- 3.1 yes you do. here is how to change it yourself, first of all, release tension on the belt tensioner. remove belt from pulleys, place a floor jack under engine on motor mount side to take off. put a piece of wood on jack to protect engine. jackup to engine with very slight pressure to hold it while removing mount. take off mount, remove old belt, put new belt on. the tensioner can be moved with a 3/8 drive in tensioner hole. after belt is on replace mount. then lower jack down. thats it!!

For convenience, I'm also including a list of other vehicles that these instructions apply:
Ford Contour ‘98–upF-150 ‘98-upFord Crown Victoria ’97-upFord Escort 99-upFord Excursion ‘00-upFord Expedition ‘98–upFord Explorer ’98-upFord Focus ‘00-upFord Mustang ’96-upFord Ranger ’98-upFord Taurus ’96-up
Ford Windstar ’98-upLincoln Continental ’98-upLincoln LS ’00-upLincoln Mark VIII ’98-upLincoln Navigator ’98-upLincoln Town Car ’98-upMercury Grand Marquis ’97-upMercury Mountaineer ’98-upMercury Mystique ’98-upMercury Sable ’96-up
NOTE: These instructions may apply to more or less vehicles than those listed above. I cannot confirm that these procedures work for every year and model listed. See your dealer if to confirm this.
On-Board Programming Method "B"
for Ford keys (1996 -early 1998 Ford, Lincoln, Mercury)
If you want to initiate a new master key....
1. Insert new key into ignition cylinder and turn it to the ON (RUN) position. The security light on the dash will flash for fifteen minutes.
2. When the security light stops flashing, you have FIVE minutes to start the next step. Turn the ignition cylinder OFF and then back to the ON (RUN) position. The security light on the dash will flash for fifteen more minutes.
3. When the security light stops flashing, you have FIVE minutes to start the next step. Turn the ignition cylinder to OFF and then back ON (RUN) position. The dash will flash for fifteen more minutes.
4. After the security light stops flashing the third time, the new key has been programmed into the vehicles computer and will operate the car. It has replaced ALL the previous electronic key codes and is the ONLY key programmed into the vehicles computer.
If you want to add a key....
1. Insert an existing key into the ignition cylinder.
2. Turn the ignition cylinder to ON (RUN) and back to OFF.
3. Remove the existing key and, within 15 seconds, insert the new key and turn it to ON (RUN).
4. The security light will light up for two seconds to indicate success in programming the key into the vehicle.
5. Don't attempt to start the vehicle with any key for at least 1 minute.
On-Board Programming Method "C"
for Ford keys (Later 1998-newer Ford, Lincoln, Mercury)
If you want to initiate a new master key....
1. This requires that the vehicle be connected to special dealer equipment. There are two ten minute delays involved while this device erases all existing key programming and sets up the vehicle computer to accept new key codes. Two new keys should be ready because the system requires a minimum of two keys in the program. After the first two keys are programmed, additional keys can be entered individually by following the instructions for adding duplicate keys (below).
If you want to add a key....
**You must have two original keys to perform this procedure. If you only have one key, you WILL have to take it to the dealer to get it programmed**
1. Insert and existing (working) key into the ignition cylinder.
2. Turn the ignition cylinder ON (RUN) and back to OFF. Ignition should stay on for at least ONE SECOND.
3. Remove the existing key and, within TEN seconds, insert a second working key and turn it to ON (RUN) and the back OFF. Ignition must be in ON for at least ONE second, but no more than TEN seconds. Remove the key.
4. Insert the new key before TWENTY seconds have elapsed and turn it to ON (RUN). Leave it the ON position for at least ONE second and turn back to OFF.
5. The security light will light up for THREE seconds to indicate that the new key has been successfully programmed.
6. To program additional keys, repeat steps 1 through 5
As a precautionary measure for all of the above procedures, you should wait at least one minute after you have performed this until you start your vehicle.